When do you feel the pulse? Do you feel it when you lay down or constantly? Could it be gas? I would go to my doctor to rule out an aneurysm.
Are you very thin? Sometimes on a thin person the abdominal aorta can be felt pulsating if you palpate the area.
I agree with both comments. I could also feel my pulse in my stomach (mostly when laying down). My cardiologist noticed it and said it could be because I am thin but he wanted me to have an ultrasound to rule out an aneurysm. Had it and no aneurysm. I would have a doctor check to be sure.